(Reply)

Someone on Reddit suggested that since Linux doesn't use BIOS calls for anything and addresses the hardware in native mode, and the hardware still supports AHCI native mode, that someone should "teach GRUB read-only RAID support" and then have the kernel set to switch the hardware out of RAID and into AHCI native mode as soon as it is loaded.

Is this an option? Sorry if this is obviously not an answer.

As for the power management thing, Dell lets you turn off the same "RAID" mode and boot Linux. What kind of runtime loss are we talking here? Can't be that bad or someone would have said something. SSDs use like 2 watts? Even if it never goes into power saving mode, it's about like turning your backlight up 5%, right?